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HL: Fachverband Halbleiterphysik

HL 39: Poster III

HL 39.17: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P3

Empowering Thermoelectric Performance of ZnSb via Bonding Interaction Regulation — •Meng Jiang^1,2, Fangyi Hu¹, Qihao Zhang², Lianjun Wang², Wan Jiang², Matthias Wuttig¹, and Yuan Yu¹ — ¹Physical Institute 1, RWTH Aachen University, Aachen, 52074, Germany. — ²Donghua University, Shanghai, 201620, China.

ZnSb compounds have garnered significant attention due to its green nature, low cost and high Seebeck coefficient. However, its thermoelectric performance has been limited by a relatively low power factor and high lattice thermal conductivity. Recent studies have demonstrated that regulating bonding interactions offers an effective strategy to optimize the thermoelectric properties. Specifically, metavalent bonding shows unprecedented success in predicting and optimizing a series of high-performance thermoelectric materials. This reignites research interest in ZnSb. We explored a one-step synthesis strategy for ZnSb and specifically investigated optimizing mechanisms of Cd and Mg. By regulating bonding interactions to optimize electrical conductivity, the room-temperature power factor was enhanced from 2.5 to 4 μW cm-1 K-2. This improvement, coupled with a reduction in lattice thermal conductivity, resulted in a zT of 0.6 at 600 K. Our work highlights the potential of bonding interaction regulation as an effective approach for enhancing the thermoelectric performance of ZnSb. More, future research would focus on unraveling the intricate mechanisms linking bonding and microstructure to achieve even higher performance.

Keywords: ZnSb; thermoelectric; bonding; thermal conductivity; doping